<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <ul v-for="(item,index) in msg">
        <li>{{ item }} <button @click="del(index)">删除</button></li>
      </ul>
      <button @click="add">生成</button>
    </div>
    <script src="./vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          msg: ["1"],
        },
        methods: {
          add() {
            this.msg.push(Math.floor(Math.random() * (20 - 0 + 1)) + 0);
          },
          del(index) {
            this.msg.splice(index, 1);
          },
        },
      });
    </script>
  </body>
</html>
